JP2021172384A - Skin pack packaging body - Google Patents

Abstract

To provide a skin pack packaging body capable of simultaneously achieving sealability and easy opening of a package.SOLUTION: A skin pack packaging body (1) includes: a frame seal part (41) provided in a frame shape to a peripheral edge; and a surface seal part (42) provided inside the frame seal part (41). A peel strength in the frame seal part (41) is higher than that in the surface seal part (42). The peel strength in the frame seal part (41) is 2 N/15 mm-10 N/15 mm. The peel strength in the surface seal part (42) is 0.5 N/15 mm-6 N/15 mm.SELECTED DRAWING: Figure 2

Description

The present invention relates to a skin pack package.

A skin pack package having a bottom material and a lid material and an object to be packaged between them is used. An example of such a skin pack package is disclosed in, for example, Japanese Patent Application Laid-Open No. 2016-222259 (Patent Document 1). Since the skin pack package is less likely to wrinkle and has a good appearance, it is suitably used for packaging, for example, ham, raw meat, cooked food, etc. as an object to be packaged. At this time, in order to securely seal the object to be packaged, it is preferable that the bottom material and the lid material are firmly sealed.

However, if the seal between the bottom material and the lid material is too strong, a large force is required at the time of opening and it becomes difficult to open.

Japanese Unexamined Patent Publication No. 2016-222259

It is desired to realize a skin pack package that has both the sealing property of the packaged object and the ease of opening.

The skin pack package according to the present invention is
A skin pack package having a bottom material and a lid material, and having an object to be packaged between the bottom material and the lid material.
A frame seal portion provided in a frame shape on the peripheral portion of the bottom material and the lid material, and a surface seal portion provided inside the frame seal portion are included.
Regarding the peel strength between the bottom material and the lid material measured in accordance with JIS Z 0238: 1998.
The peel strength at the frame seal portion is larger than the peel strength at the surface seal portion.
The peel strength of the frame seal portion is 2N / 15mm or more and 10N / 15mm or less.
The peel strength of the surface seal portion is 0.5 N / 15 mm or more and 6 N / 15 mm or less.

If the peel strength between the bottom material and the lid material in the frame seal portion is less than 2N / 15 mm, leakage may occur during the transportation of the skin pack package. On the other hand, if the peel strength between the bottom material and the lid material in the frame seal portion exceeds 10 N / 15 mm, a large force is required at the time of opening and it becomes difficult to open. Therefore, by setting the peel strength between the bottom material and the lid material in the frame seal portion to 2N / 15 mm or more and 10N / 15 mm or less, it is possible to improve the ease of opening while ensuring the sealing property of the packaged object. can.

Further, by ensuring the sealing property of the object to be packaged in the frame sealing portion, the peeling strength between the bottom material and the lid material in the sealing portion may be made smaller than the peeling strength in the frame sealing portion. Then, by actually setting the peel strength between the bottom material and the lid material in the surface sealing portion in the range of 6 N / 15 mm or more and 10 N / 15 mm or less, the ease of opening can be improved from this point as well. ..

On the other hand, when the peel strength between the bottom material and the lid material in the surface sealing portion is less than 0.5 N / 15 mm, for example, when a plurality of types of objects to be packaged are collectively packaged in a skin pack, some of the objects to be packaged come out. Moisture (drip) may migrate and reach other objects to be packaged. Therefore, by setting the peel strength between the bottom material and the lid material in the surface seal portion to 0.5 N / 15 mm or more and 6 N / 15 mm or less, the package is opened while suppressing the migration of drip and maintaining the quality of the packaged object. Ease of use can be improved.

From the above, according to the above configuration, it is possible to improve the ease of opening while ensuring the sealing property of the packaged object and maintaining its quality.

Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiments described below.

As one aspect
It is preferable that the lid material contains at least an outer layer, and the outer layer contains a polyethylene-based resin.

According to this configuration, the mechanical properties of the skin of the lid material can be improved by forming the outer layer of the lid material containing a polyethylene-based resin having a certain strength.

As one aspect
It is preferable that the degree of cross-linking of the lid material measured in accordance with JIS C3005: 2014 4.25 is 43% or more.

According to this configuration, the heat resistance of the lid material can be improved, and the mechanical properties at high temperatures can be improved.

Further features and advantages of the present invention will be further clarified by the following illustration of exemplary and non-limiting embodiments described with reference to the drawings.

Schematic cross-sectional view of the skin pack package Top view of skin pack packaging

An embodiment of the skin pack package will be described with reference to the drawings. As shown in FIG. 1, the skin pack package 1 of the present embodiment includes a bottom material 2 and a lid material 3. In this skin pack package 1, the object to be packaged 5 is packaged between the bottom material 2 and the lid material 3. The bottom material 2 and the lid material 3 are heat-sealed with the object to be packaged 5 sandwiched between them. In the skin pack package 1, the packaged object 5 can be stored in a sealed state for a certain period of time, and then the bottom material 2 and the lid material 3 can be peeled off to take out the packaged object 5.

The bottom material 2 includes at least a skin layer 21 and a sealant layer 22. The skin layer 21 is a layer that forms the skin on the outermost surface side of the bottom material 2, and can be composed of a known resin layer having a certain strength. The skin layer 21 is not particularly limited, but may be specifically composed of, for example, a polyethylene-based resin, a polypropylene-based resin, a polyester-based resin, a polyamide-based resin, a polystyrene-based resin, or the like. The polyethylene-based resin is not particularly limited, and may be, for example, a homopolymer of ethylene, a block copolymer of ethylene and another monomer, or a random copolymer of ethylene and another monomer. It's okay. Hereinafter, other "-based resins" can be considered in the same manner.

Further, as the skin layer 21, a single-layer film may be used, or a multilayer film having two or more layers may be used. When a multilayer film is used, two or more different types of resin films among the above-mentioned resin types may be combined. When bonding different resin films to each other, an adhesive resin may be used, or the resin films may be directly bonded by laminating.

The sealant layer 22 is a layer that is adhered to the sealant layer 33 of the lid material 3. The sealant layer 22 can be composed of a known resin layer that exhibits a certain sealing property. The sealant layer 22 is not particularly limited, but may be specifically composed of, for example, a polyolefin-based resin, an ionomer resin, an ethylene-based copolymer, or the like.

As the polyolefin-based resin constituting the sealant layer 22, for example, a polyethylene-based resin, a polypropylene-based resin, or the like can be used. Specific examples of the polyethylene-based resin include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE). Specific examples of the polypropylene-based resin include random copolymer polypropylene, block copolymer polypropylene, and homopolymer polypropylene. The sealant layer 22 can also be made of a laminated film containing both a polyethylene-based resin and a polypropylene-based resin, for example.

The ionomer resin is a resin obtained by intermolecularly cross-linking a polymer with metal ions, for example, an ethylene- (meth) acrylic acid copolymer or an ethylene- (meth) acrylic acid- (meth) acrylic acid ester copolymer. An example is an ethylene-based ionomer resin in which intermolecular cross-linking is performed with metal ions. Examples of the metal ion used for cross-linking include zinc ion (Zn ²⁺ ), sodium ion (Na ⁺ ), potassium ion (K ⁺ ) and the like.

Examples of the ethylene-based copolymer include an ethylene-vinyl acetate copolymer and an ethylene- (meth) acrylic acid copolymer.

The thickness of the bottom material 2 is not particularly limited, but can be, for example, 0.03 mm or more and 1.0 mm or less, and preferably 0.04 mm or more and 0.95 mm or less.

The lid material 3 includes at least a skin layer 31, an intermediate layer 32, and a sealant layer 33. The skin layer 31 is a layer that forms the skin on the outermost surface side of the lid material 3, and can be composed of a known resin layer having a certain strength. The skin layer 31 is not particularly limited, but may be specifically composed of, for example, a polyethylene-based resin, a polypropylene-based resin, a polyester-based resin, a polyamide-based resin, a polystyrene-based resin, or the like. In the present embodiment, the skin layer 31 is mainly composed of a polyethylene-based resin. In this embodiment, the skin layer 31 corresponds to the "outer layer" of the lid material 3.

Further, as the skin layer 31, a single-layer film may be used, or a multilayer film having two or more layers may be used. When a multilayer film is used, two or more different types of resin films among the above-mentioned resin types may be combined. When bonding different resin films to each other, an adhesive resin may be used, or the resin films may be directly bonded by laminating.

The intermediate layer 32 is a layer provided between the skin layer 31 and the sealant layer 33, and is a layer for blocking gas in the present embodiment. The intermediate layer 32 functions as a gas barrier layer, and can be composed of a known resin layer having a certain gas barrier property. The intermediate layer 32 is not particularly limited, but may be specifically composed of, for example, an ethylene-vinyl alcohol copolymer or the like.

The sealant layer 33 is a layer that is adhered to the sealant layer 22 of the bottom material 2. The sealant layer 33 can be composed of a known resin layer that exhibits a certain sealing property. The sealant layer 33 is not particularly limited, but specifically, for example, a polyethylene resin, an ionomer resin, an ethylene copolymer (ethylene-vinyl acetate copolymer, etc.), a mixture of a polyethylene resin and a polypropylene resin. Etc. can be configured.

The lid material 3 is a laminate of a polyethylene-based resin layer forming the skin layer 31, an ethylene-vinyl alcohol copolymer layer forming the intermediate layer 32, and an ethylene-vinyl acetate copolymer layer forming the sealant layer 33. It is preferably composed of a film. The thickness of the lid material 3 is not particularly limited, but can be, for example, 0.05 mm or more and 0.3 mm or less.

The multilayer film constituting the bottom material 2 and the lid material 3 is not particularly limited, but can be formed by, for example, a coextrusion method, an extrusion lamination method, a heat lamination method, or the like.

The packaged object 5 may be, for example, raw meat, prepared food, processed meat product, processed marine product, cooked food, or the like. The packaged object 5 may be a single type or a mixture of a plurality of types. As shown in FIG. 2, the skin pack package 1 of the present embodiment can also be suitably used when a plurality of types of objects to be packaged 5 are collectively packaged in a skin pack.

To obtain the skin pack package 1, for example, the object to be packaged 5 is placed on the bottom material 2, the lid material 3 is heated and softened, and the bottom material 2 and the cover material 3 are vacuum-formed or vacuum-formed. It is attached to the outer surface of the package 5. Then, the sealant layer 33 of the lid material 3 and the sealant layer 22 of the bottom material 2 are heat-sealed while vacuum degassing between the bottom material 2 and the lid material 3, so that the bottom material 2 and the lid material 3 are combined. It is possible to obtain a skin pack package 1 that is heat-sealed with the object to be packaged 5 sandwiched between them.

Since the lid material 3 is heated as described above during heat sealing, it is preferable to use a lid material 3 having excellent heat resistance and mechanical properties at high temperatures. From this point of view, it is preferable to use a lid material 3 having a degree of cross-linking (gel fraction) measured in accordance with JIS C3005: 2014 4.25 of 43% or more. Here, the method for evaluating the degree of cross-linking (gel fraction) is based on the phenomenon that the cross-linked portion remains as a gel when the constituent resin of the film is dissolved with a solvent. That is, the ratio (percentage) of the mass of the gel portion to the mass of the sample before being dissolved in the solvent is set as the "gel fraction", and this is used as an index showing the degree of progress of cross-linking. Specifically, the sample is immersed and held in xylene heated to 110 ° C. for 24 hours, then the sample is taken out and dried at a temperature of 100 ° C. and a vacuum degree of 1.3 kPa or less for 24 hours or more. The mass M1 of the sample before immersion in xylene and the mass M2 of the sample dried after immersion in xylene were measured, respectively, and the percentage (100 × M2 / M1) of the mass after drying with respect to the mass before immersion was defined as “gel fraction (gel fraction (100 × M2 / M1). %) ”, And the degree of cross-linking is evaluated based on this.

By using the lid material 3 having a degree of cross-linking of 43% or more, a strong three-dimensional structure is formed by cross-linking, so that the heat resistance of the lid material 3 can be improved and the mechanical properties at high temperatures can be improved. Can be improved. The degree of cross-linking (gel fraction) of the lid material 3 is preferably 50% or more, and more preferably 60% or more.

The cross-linking treatment for the lid material 3 can be performed by irradiating with high energy rays. Examples of high-energy rays to be irradiated include radiation (α rays, β rays, γ rays, X-rays, neutron rays, etc.) and electron beams (EB). The degree of cross-linking (gel fraction) of the lid material 3 can be adjusted by adjusting the absorbed dose when the lid material 3 is irradiated with high energy rays. As described above, in order to obtain the lid material 3 having a degree of cross-linking of 43% or more, for example, high-energy ray irradiation may be performed at an absorbed dose of about 60 kGy.

As shown in FIG. 1, in the skin pack package 1 of the present embodiment, the bottom material 2 and the lid material 3 are joined by a sealing portion 4. Here, the seal portion 4 is composed of the sealant layer 22 of the bottom material 2 and the sealant layer 33 of the lid material 3. Further, as shown in FIG. 2, the seal portion 4 of the present embodiment includes a frame seal portion 41 and a surface seal portion 42. The frame seal portion 41 is provided in a frame shape on the peripheral portions of the bottom member 2 and the lid member 3 in a plan view. The frame seal portion 41 can be formed so as to have a width of, for example, 5 mm to 30 mm, although it depends on the overall size of the skin pack package 1. The surface seal portion 42 is provided inside the frame seal portion 41 formed in a frame shape in a plan view.

The skin pack package 1 of the present embodiment is characterized in that the peel strength between the bottom material 2 and the lid material 3 measured in accordance with JIS Z 0238: 1998 satisfies the following three conditions. ..
[1] The peel strength of the frame seal portion 41 is larger than the peel strength of the surface seal portion 42 (condition 1).
[2] The peel strength of the frame seal portion 41 is 2N / 15 mm or more and 10N / 15 mm or less (Condition 2).
[3] The peel strength of the surface seal portion 42 is 0.5 N / 15 mm or more and 6 N / 15 mm or less (Condition 3).

In the skin pack package 1, at least the frame sealing portion 41 provided in a frame shape on the peripheral portion of the bottom material 2 and the lid material 3 is sufficiently peeled off in order to ensure the sealing property of the object to be packaged 5. It is enough if it has strength. Rather, if the peel strength at the portion other than the frame seal portion 41 (the surface seal portion 42 inside the frame seal portion 41) is higher than necessary, on the contrary, an excessive force is required when opening the seal, making it difficult to open. Become. Therefore, on the premise that the bottom material 2 and the lid material 3 are heat-sealed so as to satisfy the condition 1 and the sealability of the object to be packaged 5 is ensured by the frame sealing portion 41, the skin pack package 1 is used. It is possible to prevent the seal strength as a whole from becoming excessive and facilitate opening.

If the peel strength between the bottom material 2 and the lid material 3 in the frame seal portion 41 is less than 2N / 15 mm, when moisture (drip) comes out from a part of the object to be packaged 5, the drip is the skin pack package. There is a possibility of leakage during the transportation of 1. On the other hand, if the peel strength between the bottom material 2 and the lid material 3 in the frame seal portion 41 exceeds 10 N / 15 mm, a large force is required at the time of opening and it becomes difficult to open. Therefore, by heat-sealing the bottom material 2 and the lid material 3 so as to satisfy the condition 2, it is possible to improve the ease of opening while ensuring the sealability of the packaged object 5. The peel strength between the bottom material 2 and the lid material 3 in the frame sealing portion 41 is preferably 2.5 N / 15 mm or more, and more preferably 3 N / 15 mm or more. Further, the peel strength between the bottom material 2 and the lid material 3 in the frame sealing portion 41 is preferably 9.5 N / 15 mm or less, and more preferably 9 N / 15 mm or less.

If the peel strength between the bottom material 2 and the lid material 3 in the surface sealing portion 42 is less than 0.5 N / 15 mm, for example, when a plurality of types of objects to be packaged 5 are collectively packaged in a skin pack, a part of the objects to be packaged is packaged. Moisture (drip) from the object may migrate and reach the other packaged object 5. On the other hand, when the peel strength between the bottom material 2 and the lid material 3 in the surface seal portion 42 exceeds 6 N / 15 mm, the peel strength in the surface seal portion 42 is made smaller than the peel strength in the frame seal portion 41, so that the seal can be easily opened. As a result, the effect of improving the seal is diminished. Therefore, by heat-sealing the bottom material 2 and the lid material 3 so as to satisfy the condition 3, the ease of opening is improved while suppressing the migration of drip and maintaining the quality of each packaged object 5. Can be made to. The peel strength between the bottom material 2 and the lid material 3 in the surface sealing portion 42 is preferably 0.7 N / 15 mm or more, and more preferably 1.0 N / 15 mm or more. Further, the peel strength between the bottom material 2 and the lid material 3 in the surface sealing portion 42 is preferably 5.5 N / 15 mm or less, and more preferably 5 N / 15 mm or less.

For example, when the skin pack package 1 is formed by compressed air molding, the surface seal portion 42 is formed by pseudo-adhesion by differential pressure, and then pressurized with a frame-shaped hot plate (for example, 3 to 8 kgf / cm ² ). The frame seal portion 41 can be formed. In this case, the peel strength between the bottom material 2 and the lid material 3 in the frame seal portion 41 is the strength due to heat sealing with the hot plate, and the peel strength in the surface seal portion 42 is the strength due to pseudo-adhesion. Become. The peeling strength between the bottom material 2 and the lid material 3 in the frame seal portion 41 and the surface seal portion 42 can be adjusted by, for example, adjusting the heating temperature, the heat seal temperature, the heating time, the heat seal time, and the like. can.

A plurality of test examples will be shown below, and the present invention will be described in more detail. However, the scope of the present invention is not limited by the specific test examples described below.

[Test Example 1]
As the bottom material 2, a polyamide layer (1030B2 manufactured by Ube Industries, Ltd.) and an ethylene-vinyl alcohol copolymer layer (J171B manufactured by Kuraray Co., Ltd.) constituting the skin layer 21 are laminated, and an ionomer layer constituting the sealant layer 22 is further laminated. (Hi-Milan 1855 manufactured by Mitsui Dow Polychemical Co., Ltd.) was laminated. The thickness of this laminated sheet was 150 μm. Further, as the lid material 3, the polyethylene layer forming the skin layer 31 (Ube polyethylene 4040FC manufactured by Ube Maruzen Polyethylene Co., Ltd.) and the ethylene-vinyl alcohol copolymer layer forming the intermediate layer 32 (Soanol GH3804B manufactured by Mitsubishi Chemical Co., Ltd.) ) And an ethylene-vinyl acetate copolymer layer (Evaflex V5714C manufactured by Mitsui-Dau Polychemical Co., Ltd.) constituting the sealant layer 33 were prepared. The thickness of this laminated sheet was 120 μm.

Using a tray sealer (MULTIVAC T300) manufactured by Tokyo Food Machinery Co., Ltd., which has a frame sealing function, the bottom material 2 and the bottom material 2 are used under the conditions of heating temperature: 140 ° C., frame width: 2 cm, sealing time: frame 1 second and surface 4 seconds. The lid material 3 and the object to be packaged 5 (cooked hamburger, potato, broccoli) were sandwiched between them and heat-sealed to obtain a skin pack package 1. The peel strength of the surface seal portion 42 and the frame seal portion 41 of the obtained skin pack package 1 was measured in accordance with JIS Z 0238: 1998 and found to be 1.0 N / 15 mm and 9.5 N / 15 mm, respectively. there were.

[Test Example 2]
A skin pack package 1 was obtained in the same manner as in Test Example 1 except that the heating temperature during heat sealing was 150 ° C. The peel strength of the surface seal portion 42 and the frame seal portion 41 was 1.4 N / 15 mm and 10.5 N / 15 mm, respectively.

[Test Example 3]
A skin pack package 1 was obtained in the same manner as in Test Example 1 except that the heating temperature during heat sealing was 160 ° C. The peel strength of the surface seal portion 42 and the frame seal portion 41 was 2.1 N / 15 mm and 11.3 N / 15 mm, respectively.

[Test Example 4]
A skin pack package 1 was obtained in the same manner as in Test Example 1 except that the sealant layer 22 of the bottom material 2 was composed of a polyethylene layer (UBE polyethylene F222NH manufactured by Ube-Maruzen Polyethylene Co., Ltd.). The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 0.4 N / 15 mm and 8.0 N / 15 mm, respectively.

[Test Example 5]
A skin pack package 1 was obtained in the same manner as in Test Example 4 except that the heating temperature during heat sealing was 150 ° C. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 0.5 N / 15 mm and 8.5 N / 15 mm, respectively.

[Test Example 6]
A skin pack package 1 was obtained in the same manner as in Test Example 4 except that the heating temperature at the time of heat sealing was 160 ° C. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 1.0 N / 15 mm and 9.0 N / 15 mm, respectively.

[Test Example 7]
Same as Test Example 1 except that the sealant layer 22 of the bottom material 2 is composed of a polyethylene-based easy peel layer (UBE polyethylene F324C manufactured by Ube-Maruzen Polyethylene Co., Ltd .: Sumitomo Noblen S131 = 85: 15 manufactured by Sumitomo Chemical Co., Ltd.). Then, the skin pack package 1 was obtained. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 0.3 N / 15 mm and 7.6 N / 15 mm, respectively.

[Test Example 8]
A skin pack package 1 was obtained in the same manner as in Test Example 7 except that the heating temperature during heat sealing was 150 ° C. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 0.4 N / 15 mm and 8.0 N / 15 mm, respectively.

[Test Example 9]
A skin pack package 1 was obtained in the same manner as in Test Example 7 except that the heating temperature at the time of heat sealing was 160 ° C. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 1.2 N / 15 mm and 8.5 N / 15 mm, respectively.

[Test Example 10]
Same as Test Example 1 except that the sealant layer 22 of the bottom material 2 is composed of a polypropylene-based easy peel layer (UBE polyethylene F522 manufactured by Ube-Maruzen Polyethylene Co., Ltd .: Sumitomo Noblen S131 = 30:70 manufactured by Sumitomo Chemical Co., Ltd.). Then, the skin pack package 1 was obtained. The peel strength of the surface seal portion 42 and the frame seal portion 41 was 0.6 N / 15 mm and 2.6 N / 15 mm, respectively.

[Test Example 11]
A skin pack package 1 was obtained in the same manner as in Test Example 10 except that the heating temperature during heat sealing was 150 ° C. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 1.0 N / 15 mm and 3.0 N / 15 mm, respectively.

[Test Example 12]
A skin pack package 1 was obtained in the same manner as in Test Example 10 except that the heating temperature during heat sealing was 160 ° C. The peel strength of the surface seal portion 42 and the frame seal portion 41 was 1.5 N / 15 mm and 3.4 N / 15 mm, respectively.

[Test Example 13]
Test Example 1 except that the sealant layer 22 of the bottom material 2 was composed of a polypropylene resin and a polyethylene resin mixed layer (Hi-Zex 5700 manufactured by Prime Polymer Co., Ltd .: Prime Polypro F113A = 15: 85 manufactured by Prime Polymer Co., Ltd.). In the same manner as above, a skin pack package 1 was obtained. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 0.1 N / 15 mm and 1.4 N / 15 mm, respectively.

[Test Example 14]
A skin pack package 1 was obtained in the same manner as in Test Example 13 except that the heating temperature at the time of heat sealing was set to 150 ° C. The peel strengths of the surface seal portion 42 and the frame seal portion 41 were 0.1 N / 15 mm and 2.0 N / 15 mm, respectively.

[Test Example 15]
A skin pack package 1 was obtained in the same manner as in Test Example 13 except that the heating temperature during heat sealing was 160 ° C. The peel strength of the surface seal portion 42 and the frame seal portion 41 was 1.0 N / 15 mm and 3.2 N / 15 mm, respectively.

[Test Example 16]
A skin pack package 1 was obtained in the same manner as in Test Example 1 except that the sealant layer 22 of the bottom material 2 was composed of a polypropylene resin layer (Sumitomo Noblen FL8115A manufactured by Sumitomo Chemical Co., Ltd.). The peel strength of the surface sealing portion 42 and the frame sealing portion 41 was 0N / 15mm and 2.2N / 15mm, respectively.

[Test Example 17]
A skin pack package 1 was obtained in the same manner as in Test Example 16 except that the heating temperature during heat sealing was 150 ° C. The peel strengths of the surface sealing portion 42 and the frame sealing portion 41 were 0N / 15mm and 3.0N / 15mm, respectively.

[Test Example 18]
A skin pack package 1 was obtained in the same manner as in Test Example 16 except that the heating temperature at the time of heat sealing was 160 ° C. The peel strength of the surface seal portion 42 and the frame seal portion 41 was 1.0 N / 15 mm and 4.0 N / 15 mm, respectively.

With respect to the skin pack package 1 obtained in each test example, after 600 km of test transportation, the presence or absence of drip migration inside the skin pack package 1, the presence or absence of lifting in the frame seal portion 41, and the presence or absence of the skin pack package 1 The feeling of opening was evaluated.

The presence or absence of drip migration was determined by visual observation according to the following criteria.
〇: Drip transition occurred ×: Drip transition did not occur

The presence or absence of floating was determined by visual observation according to the following criteria.
〇: Lifting occurred ×: Lifting did not occur

The feeling of opening was judged according to the following criteria by the sensory evaluation at the time of the demonstration.
〇: Easy to open with light force ×: It took a lot of force to open

The above results are shown in Table 1.

From these results, when the peel strength of the frame sealing portion 41 is 2N / 15mm or more and 10N / 15mm or less, the lifting during transportation is suppressed (sealing property is ensured) and the ease of opening is improved. It was confirmed that Further, the peel strength of the surface seal portion 42 is smaller than the peel strength of the frame seal portion 41, and is 0.5 N / 15 mm or more and 6 N / 15 mm or less, so that the drip can be easily opened while ensuring the ease of opening. It was confirmed that the migration can be suppressed.

The embodiments disclosed in the present specification are exemplary in all respects and can be appropriately modified without departing from the spirit of the present disclosure.

1 Skin pack package 2 Bottom material 3 Cover material 4 Seal part 5 Packaged object 21 Skin layer 22 Sealant layer 31 Skin layer (outer layer)
32 Intermediate layer 33 Sealant layer 41 Frame seal part 42 Face seal part

Claims (3)

A skin pack package having a bottom material and a lid material, and having an object to be packaged between the bottom material and the lid material.
A frame seal portion provided in a frame shape on the peripheral portion of the bottom material and the lid material, and a surface seal portion provided inside the frame seal portion are included.
Regarding the peel strength between the bottom material and the lid material measured in accordance with JIS Z 0238: 1998.
The peel strength at the frame seal portion is larger than the peel strength at the surface seal portion.
The peel strength of the frame seal portion is 2N / 15mm or more and 10N / 15mm or less.
A skin pack package having a peel strength of 0.5 N / 15 mm or more and 6 N / 15 mm or less at the surface seal portion. The skin pack package according to claim 1, wherein the lid material contains at least an outer layer, and the outer layer contains a polyethylene-based resin. The skin pack package according to claim 1 or 2, wherein the degree of cross-linking of the lid material measured in accordance with JIS C3005: 2014 4.25 is 43% or more.

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